Noise from unsaturated DC erasure and peak shift of signals in longitudinal thin-film disk media

In thin-film magnetic recording media, noise increases as bit density increases, and is mainly associated with magnetic transition. The present study concerns generation of noise equivalent to this transition noise on thin film disk media using an unsaturated DC erasure method without writing transitions. The relationship between media noise waveform and peak shift of signals measured in a bit-by-bit manner is also investigated. Good relationship between peak shift and H
c
fluctuation of media as the integration of the media noise waveform is found.